Chat room with thin walls

ABSTRACT

A method, system and graphical user interface for a chat room system is disclosed. One aspect of certain embodiments includes sending messages that originate from a user&#39;s current chat room as well as messages that originate from nearby chat rooms to the user. Both types of messages are displayed in a single context to the user.

RELATED APPLICATION

This application is related to U.S. patent application Ser. No. 11/726,468, filed Mar. 21, 2007, entitled “Graphical User Interface for Chat Room with Thin Walls,” which is filed concurrently herewith, and which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The disclosed embodiments relate generally to chat systems. More particularly, the disclosed embodiments relate to methods, systems, and user interfaces for allowing a user to receive messages from various chat rooms, and the messages are displayed in a single context to the user.

BACKGROUND

Chat system technology, commonly referred to as online chat, allows users to communicate in near-real time over a network, such as the Internet or an intranet. The most common forms of online chat are direct, one-to-one chat, commonly referred to as instant messaging (or “IM”), and chat rooms. A chat room allows multiple users to communicate synchronously within the confines of the chat room.

User interactions in chat room systems include: entering a particular chat room as an active user to type in messages and/or view messages, replying to messages in a chat room, saving messages displayed during a chat session, and switching to a different chat room.

When a user is interested in conversing with other users (participants) in a particular chat room, the user enters the room either as a registered user or as a guest. Each participant of the particular chat room sees a message window for that chat room. Participants' messages appear in the message window in the order that the messages are posted. A user can respond to a recent message by posting a reply in a response dialog box. In a chat client, the newest messages are displayed either at the top or bottom of the message window. A message window will display a pre-determined number of messages. When the maximum number of messages is reached, older messages are scrolled off the message window to make room for newer messages as they are posted. Once a message has scrolled off the message window, such a message typically cannot be redisplayed.

There are many different technologies for implementing chat systems. One common chat technology is referred to as IRC, short for “Internet Relay Chat.” IRC is a client-server technology in which users must use a specific IRC client program to select and log in to chat rooms. IRC chat clients and chat server employ the TCP/IP (Internet) protocol for communications. Web-based chat technologies are also available.

In current chat systems, if a user wishes to participate in multiple chat rooms, the user must open multiple sessions to keep track of different chat rooms. Further, the current technology does not provide a convenient way for automatically determining which chat rooms/conversations are likely to be of interest to the user.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the aforementioned aspects of the invention as well as additional aspects and embodiments thereof, reference should be made to the Description of Embodiments below, in conjunction with the following drawings in which like reference numerals refer to corresponding parts throughout the figures.

FIG. 1 is a block diagram illustrating an exemplary distributed computer system according to one embodiment of the invention.

FIG. 2 is a block diagram illustrating a chat subsystem, according to certain embodiments of the invention.

FIG. 3 is a block diagram illustrating a client, according to certain embodiments of the invention.

FIG. 4 is a non-limiting example of a hierarchy of chat rooms, according to certain embodiments.

FIG. 5 is a high-level flowchart representing some of the steps for implementing a chat room system, according to certain embodiments of the invention.

FIG. 6 is a schematic of a chat room GUI for displaying messages to the user in the current chat room, according to certain embodiments of the invention.

DESCRIPTION OF EMBODIMENTS

Methods, systems, user interfaces, and other aspects of the invention are described. Reference will be made to certain embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the embodiments, it will be understood that it is not intended to limit the invention to these particular embodiments alone. On the contrary, the invention is intended to cover alternatives, modifications and equivalents that are within the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Moreover, in the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that the invention may be practiced without these particular details. In other instances, methods, procedures, components, and networks that are well known to those of ordinary skill in the art are not described in detail to avoid obscuring aspects of the present invention.

According to certain embodiments of the invention, a user of a chat room system receives messages that originate from the user's current chat room as well as messages that originate from one or more additional chat rooms. Messages from the current chat room and from the one or more additional chat rooms are displayed in a single context to the user. Such additional chat rooms from which messages are sent to the user are referred to herein as “nearby” chat rooms. The term “nearby” is not limited to the concept of spatial distances. For example, a particular chat room is deemed “nearby” to the current chat room if the particular chat room is popular or is a forum for topics similar to that of the current chat room. Chat rooms that qualify as “nearby” relative to the current chat room can be determined based on one or more non-limiting criteria or rules from the following non-exhaustive set: 1) the user can specify which chat rooms qualify as “nearby”; 2) chat rooms that are within a certain distance from the current chat room, if the chat rooms are organized in a hierarchy or other graph, qualify as “nearby”; 3) chat rooms in a sub-tree that satisfies a set of sub-tree criteria qualify as “nearby”; 4) chat rooms that have a topic that is similar to the topic of the current chat room qualify as “nearby”; 5) chat rooms in which occur one or more conversations that are similar to those in the current chat room qualify as “nearby”; 6) chat rooms that reach a threshold number of active users qualify as “nearby”; 7) a subset of chat rooms that collectively originate a threshold number of messages qualify as “nearby”; and 8) the user can define a set of criteria that chat rooms need to satisfy in order to qualify as “nearby.”

According to certain embodiments, a graphical user interface is provided to display the messages that originate from the user's current chat room as well as messages that originate from “nearby” chat rooms in a single context. The messages that originate from the user's current chat room may be displayed based on display attributes that are different from the display attributes associated with messages that originate from “nearby” chat rooms. For example, display attributes may vary in color, typeface, font, and color intensity. According to some embodiments, messages that originate from the user's current chat room are interleaved with messages that originate from “nearby” chat rooms in chronological order when displayed to the user using the graphical interface. According to certain embodiments, the graphical user interface includes features for filtering messages that originate from the user's current chat room and from nearby chat rooms for display.

FIG. 1 is a block diagram illustrating an exemplary distributed computer system 100, according to one embodiment of the invention. In FIG. 1, system 100 may include one or more client computers 102, a communications network 106 and a chat room subsystem 108. Client computers 102 can be any of a number of computing devices (e.g., Internet kiosk, personal digital assistant, cell phone, gaming device, desktop computer, laptop computer, handheld computer, or combinations thereof) used to enable the activities described below. Client computer(s) 102 is also referred to herein as client(s). Client 102 includes a graphical user interface (GUI) 111. One embodiment of client 102 is described in greater detail herein with reference to FIG. 3. Client 102 is connected to chat room subsystem 108 via communications network 106. Chat room subsystem 108 includes one or more servers, such as server 112, connected to the communications network 106 via network communication module 122. Chat room subsystem 108 may also include user database 116, chat room database 120 and other databases 118.

Server 112 includes user processing module 124, and a chat application 128. The network communications module 122 connects server 112 to the communication network 106 and enables the receipt of communications from the communication network 106 and the provision of communications to the communication network 106 bound for client 102 or other destinations. Server 112 communicates with databases such as user database 116, chat room database 120 and other databases 118 via network communication module 122. One embodiment of server 112 is described in greater detail herein with reference to FIG. 2.

In the case of multiple servers, each server, such as server 112, is coupled to a communications network 106 via a network communication module 122. The communications network 106 may be the Internet, but may also be any local area network (LAN) and/or wide area network (WAN). In some embodiments, server 112 is a Web server that manages chat rooms and chat room messages using appropriate chat protocols. Alternatively, if server 112 is used within an intranet, it may be an intranet server.

Chat application 128 is used for organizing the chat room system hierarchy or other graph, and/or for managing the traffic of chat messages in the respective chat rooms, according to certain embodiments. The user information processing module 124 assists in accessing, updating and modifying the user information database 116. The user information database 116 stores various information about the user as described in greater detail herein. In some embodiments, the user information database 116 stores user profiles. Chat room database 120 may store global information of chat room subsystem 108 and information about each chat room in chat room subsystem 108. The other databases 118 optionally include other databases with which the various modules in server 112 may interact, such as a message database for storing messages from the various chat rooms.

In essence, server 112 is configured to manage certain aspects of chat room subsystem 108, including receiving requests from the user (associated with client 102), sending chat messages to clients 102 for display and receiving information, such as messages, user registration information and user preferences from clients 102.

In some embodiments, fewer and/or additional modules, functions or databases are included in chat room subsystem 108 and server 112. The modules shown in chat room subsystem 108 and server 112 represent functions performed in certain embodiments.

Notwithstanding the discrete blocks in FIG. 1, the figure is intended to be a functional description of some embodiments of the invention rather than a structural description of functional elements in the embodiments. One of ordinary skill in the art will recognize that an actual implementation might have the functional elements grouped or split among various components. For example, user information database 116 may be part of server 112. In some embodiments, user information database 116 may be implemented using one or more servers whose primary function is to store and process user information. Similarly, chat room database 120 may be implemented on one or more servers. Moreover, one or more of the blocks in FIG. 1 may be implemented on one or more servers designed to provide the described functionality. Although the description herein refers to certain features implemented in client 102 and certain features implemented in server 112, the embodiments of the invention are not limited to such distinctions. For example, features described herein as being part of server 112 could be implemented in whole or in part in client 102, and vice versa.

FIG. 2 is a block diagram illustrating chat subsystem 108, according to certain embodiments of the invention. Chat subsystem 108 includes one or more processing units (CPU's) 202, one or more network or other communications interfaces 204, memory 206, and one or more communication buses 208 for interconnecting these components. Chat subsystem 108 optionally may include a user interface 210 comprising a display device 212 and a keyboard 214. The communication buses 208 may include circuitry (sometimes called a chipset) that interconnects and controls communications between system components.

Memory 206 may include high speed random access memory and may also include non-volatile memory, such as one or more magnetic or optical disk storage devices. Memory 206 may optionally include one or more storage devices remotely located from the CPU(s) 202. Memory 206, or one or more of the storage devices (e.g., one or more non-volatile storage devices) in memory 206, includes a computer readable storage medium. In some embodiments, memory 206 or the computer readable storage medium of memory 206 stores the following programs, modules and data structures, or a subset or superset thereof:

-   -   an operating system 216 that includes procedures for handling         various basic system services and for performing hardware         dependent tasks;     -   a network communication module (or instructions) 122 that is         used for connecting chat subsystem 108 to other computers (e.g.,         clients 102) via one or more communication network interfaces         204 (wired or wireless) and one or more communication networks,         such as the Internet, other wide area networks, local area         networks, metropolitan area networks, and so on;     -   a server 112 for managing certain aspects of chat subsystem 108;     -   a user information database 116 for storing information about         users as described herein with reference to FIG. 5;     -   a chat room database 120 for storing information about the chat         rooms in chat subsystem 108; and     -   other databases 118 that the various modules in server 112 may         interact with, such as a message database.

In some embodiments, server 112 includes the following non-limiting examples of elements, or a subset of such elements: a user information processing module 124, and a chat application program 128. The functions of chat application program 128 are described in greater detail herein with reference to FIG. 5. User information processing module 124 may be used for accessing and modifying user information database 116. In some embodiments, server 112 and/or the databases 116, 118 and 120 include additional modules.

FIG. 3 is a block diagram illustrating client 102, according to certain embodiments of the invention. Client 102 includes one or more processing units (CPUs) 302, one or more network or other communications interfaces 304, memory 306, and one or more communication buses 308 for interconnecting these components. The communication buses 308 may include circuitry (sometimes called a chipset) that interconnects and controls communications between system components. Client 102 may include a user interface 310, for instance a display 312 with GUI 111 and a keyboard 314. Memory 306 may include high speed random access memory and may also include non-volatile memory, such as one or more magnetic or optical storage disks. Memory 306 may include mass storage that is remotely located from CPUs 302. Memory 306, or one or more of the storage devices (e.g., one or more non-volatile storage devices) in memory 306, includes a computer readable storage medium. Memory 306 or the computer readable storage medium of memory 306 may store the following elements, or a subset or superset of such elements:

-   -   an operating system 316 that includes procedures for handling         various basic system services and for performing hardware         dependent tasks;     -   a network communication module (or instructions) 318 that is         used for connecting the client 102 to other computers via the         one or more communications network interfaces 304 (wired or         wireless) and one or more communication networks, such as the         Internet, other wide area networks, local area networks,         metropolitan area networks, and so on;     -   a client assistant 322 (e.g., a toolbar, iframe (inline frame),         or browser plug-in), which includes a monitoring module 324 for         monitoring the activities of a user, and a transmission module         326 for transmitting information about the user's activities to         and receiving information from the chat room subsystem 108;     -   client applications 328 such as a client chat application         program 330 and a browser application program 332. The function         of client chat application 330 is described in greater detail         herein with reference to FIG. 5 and FIG. 6; and     -   client storage 334 for storing data, including current chat room         message display attributes 336 and nearby chat room display         attributes 338. Current chat room message display attributes 336         and nearby chat room display attributes 338 are described in         greater detail herein with reference to FIG. 5 and FIG. 6.

The above identified modules and applications in FIG. 2 and FIG. 3 correspond to a set of instructions for performing a function described above. These modules (i.e., sets of instructions) need not be implemented as separate software programs, procedures or modules, and thus various subsets of these modules may be combined or otherwise re-arranged in various embodiments. In some embodiments, memories 206 and 306 may store a subset of the modules and data structures identified above. Furthermore, memories 206 and 306 may store additional modules and data structures not described above.

Although FIG. 2 and FIG. 3 show chat room subsystem 108 and client 102 as a number of discrete items, FIG. 2 and FIG. 3 are intended more as a functional description of the various features which may be present in chat room subsystem 108 and client 102 rather than as a structural schematic of the embodiments described herein. In practice, and as recognized by those of ordinary skill in the art, items shown separately could be combined and some items could be separated. For example, some items shown separately in FIG. 2 could be implemented on single servers and single items could be implemented by one or more servers. The actual number of servers in chat room subsystem 108 and how features are allocated among them may vary from implementation to implementation, and may depend in part on the amount of data traffic that the system handles during peak usage periods as well as during average usage periods.

In one non-limiting example, the chat rooms in the chat room system are organized in a hierarchy or other graph based on the topic of discussion in a respective chat room. For example, server 112 may use an application program such as chat application program 128 to organize the chat rooms. For purposes of explanation, assume a set of chat rooms is organized in a hierarchy as shown in FIG. 4. FIG. 4 is a non-limiting example of a hierarchy of chat rooms, according to certain embodiments. The hierarchy shown in FIG. 4 is merely illustrative and is meant to help explain certain aspects of some of the embodiments. The chat rooms need not be organized in a hierarchy or in any particular manner. FIG. 4 shows a first level of nodes 402, a second level of nodes 404, a third level of nodes 406, and a fourth level of nodes 408 in the hierarchy. The number of levels of nodes, the number of nodes in each level, and the category at a given node may vary from implementation to implementation. For purposes of illustration, the first level nodes include the categories Arts 402 a, Health 402 b, and Sports 402 c, which represent chat rooms in the stated categories. The second level nodes 404 represent a more granular set of categories such as sub-categories 404 a-404 g. Likewise, the third level nodes 406 and the fourth level nodes 408 represent sub-categories of increasing granularity, such as sub-categories 406 a-406 h and 408 a-408 b, respectively. Each category or sub-category at a given level may or may not be sub-divided into further sub-categories. For example, second level sub-categories Ceramics 404 a, Visual Arts 404 b, Weight Loss 404 c and Contact Sports 404 f are further sub-divided, whereas sub-categories Acupuncture 404 d, Herbs 404 e and Iron Man 404 g are not further sub-divided.

More generally, the chat rooms can be arranged in any sort of graph structure where some kind of similarity between chat room topics (or other aspects of the chat rooms, such as the identity of participants) is expressed as a link in the graph between nodes representing the rooms. In one implementation of a complex graph, the chat rooms might be organized in a topic-based hierarchy with the addition of arbitrary cross-links between chat rooms that reflect some similarity between chat rooms that is not expressed by the hierarchy. For example, referring to FIG. 4, a chat room dedicated to discussions about “Ballet” might be categorized under the first level “Arts” category 402 a and also have a cross link under the first level “Sports” category 402 c (reflecting a view of Ballet as both an Art and a Sport). Systems that organize arbitrary information into hierarchies are likely to result in organizational schemes that are incomplete and/or counter-intuitive and as a result produce complex system graphs. As a result, by accommodating hierarchies/graphs of chat rooms with arbitrary linkages, some embodiments of the present invention are operable with chat room systems that are organized in any manner.

FIG. 5 is a high-level flowchart representing some of the steps for implementing a chat room system, according to certain embodiments of the invention. FIG. 5 shows some of the processes performed by server 112. It will be appreciated by those of ordinary skill in the art that one or more of the acts described may be performed by hardware, software, or a combination thereof, as may be embodied in one or more computing systems. FIG. 5 is described with reference to FIGS. 2 and 3. FIG. 5 is also described with reference to FIG. 4 for purposes of explaining, among other aspects, one concept of “nearness” and “nearby rooms”. For purposes of explanation, assume that the chat rooms are organized in the hierarchy that is illustrated in FIG. 4. However, as described above, the chat rooms need not be organized in any particular manner. Further assume that a user selects a chat room from the hierarchy of FIG. 4 and enters the chat room. The chat room that the user is currently in is referred to herein as the “current chat room”.

Server 112 receives (502) a request from a user via client 102 to enter the chat room selected by the user. In addition to sending the request to enter the selected chat room, the user may send registration information, such as a username and password, to server 112, via communications network 122. Server 112 associates data received from client 102 with a particular user record in user information database 116. For example, user information processing module 124 may be used to verify login information and associate chat messages entered by the user with the user's data record in user information database 116. In some embodiments, the user may be identified using a cookie stored on the client 102, or by a user identifier that is stored by and associated with a browser toolbar or browser extension. According to some embodiments, server 112 uses chat room application 128 to communicate with databases 116, 118 and 120.

Server 112 (504) uses chat room application 128 to determine which chat rooms in the hierarchy/graph are “nearby” relative to the selected current chat room. The messages received by the user in the current chat room include messages that are posted contemporaneously in the nearby chat rooms. The manner in which such messages are received by the user is described in greater detail herein with reference to blocks 506 and 508. Nearby chat rooms may be determined by implementing one or more of the following non-limiting examples:

-   -   User-selected chat rooms: The user can specify which chat rooms         in the hierarchy qualify as “nearby.” For example, the chat         application program 128 may give the user an option to designate         one or more chat rooms in the hierarchy as “nearby” rooms,         relative to the current chat room.     -   Distance function: Chat rooms that are within a certain distance         from the current chat room in the hierarchy or other graph         qualify as “nearby”, where the distance is based on a defined         distance function. To illustrate, chat rooms that are within a         given number of nodes from the current chat room node, in any         direction, qualify as “nearby.” The defined distance function         may be defined by the chat system or by the user. If the user         has the option of defining the distance function, the chat         system default definition is used in the event that the user         declines to provide a distance function. Alternatively, if the         user declines to provide a distance function, some other system         default criteria or other user-defined criteria may be used to         determine “nearness.” In some embodiments, the distance function         is based on the graph distance between the current chat room and         other chat rooms, where “graph distance” is defined—even for the         most complex graphs—as the minimum number of links in a graph         that are traversed when moving from one node (e.g., chat room)         in the graph to another node/chat room in the graph.     -   Sub-tree: For chat rooms that are organized in a hierarchy, the         chat rooms in a sub-tree qualify as “nearby,” if the sub-tree         satisfies a set of sub-tree criteria. The sub-tree criteria may         be defined by the chat system or by the user. If the user has         the option of defining the sub-tree criteria, the chat system         default definition is used in the event that the user declines         to define the sub-tree criteria. Alternatively, if the user         declines to define a sub-tree criteria, some other system         default criteria or other user-defined criteria may be used to         determine “nearness.”     -   Topic similarity: Chat rooms that have a topic that is similar         to the topic of the current chat room qualify as “nearby.” For         example, a categorization tool may be used to find chat rooms         that have a topic that is similar to the topic of the current         chat room. In some embodiments, topic similarity can be         determined using thesaurus lookup on words in room titles or         descriptions.     -   Conversation similarity: Chat rooms in which occur one or more         conversations that are similar to those in the current chat room         qualify as “nearby.” For example, a categorization tool may be         used to determine which conversations are similar. In some         embodiments, conversation similarity can be determined using         thesaurus lookup on conversation titles or descriptions.     -   Number of active users: Chat rooms that reach a threshold number         of active users qualify as “nearby.” The threshold number may be         defined by the chat system or by the user. If the user has the         option of defining the threhold number, the chat system default         definition is used in the event that the user declines to         provide a threshold number. As another example, a subset of chat         rooms that collectively originate a threshold number of active         users qualify as “nearby.” The subset of chat rooms may comprise         chat rooms at surrounding nodes relative to the node of the         current chat room. The subset of chat rooms only includes as         many rooms as are necessary to meet the threshold number of         active users, collectively. Thus, the subset of chat rooms may         shrink or expand depending on the collective number of active         users at a given time. Alternatively, if the user declines to         provide a threshold number, some other default criteria or other         user-defined criteria may be used to determine “nearness.”     -   Number of messages: A subset of chat rooms that collectively         originate a threshold number of messages qualify as “nearby.”         The subset of chat rooms may comprise chat rooms at surrounding         nodes relative to the node of the current chat room. The subset         of chat rooms only includes as many rooms as are necessary to         meet the threshold number of messages, collectively. Thus, the         subset of chat rooms may shrink or expand depending on the         number of messages that are generated at a given time. The         threshold number may be defined by the chat system or by the         user. If the user has the option of defining the threshold         number, the chat system default definition is used in the event         that the user declines to provide a threshold number.         Alternatively, if the user declines to provide a threshold         number, some other default criteria or other user-defined         criteria may be used to determine “nearness.”     -   User-defined criteria: The user can define a set of criteria         that chat rooms in the hierarchy need to satisfy in order to         qualify as “nearby.” As a non-limiting example, the user-defined         criteria may be a function of one or more aspects of the chat         room system. To illustrate, the user may specify that chat rooms         with topics related to sports qualify as being “nearby.” As         another illustration, the user may specify that chat rooms with         topics that contain the word “art” qualify as “nearby.” As yet         another example, chat rooms that are determined as popular by         users or by the number of messages may qualify as “nearby.”

To illustrate the concept of “nearby” chat rooms, assume that the user's current chat room is at node, Weight loss 404 c, of FIG. 4. Further assume that topic similarity is one of the criteria for determining “nearby” chat rooms. In such a case, the nearby rooms may include the respective chat rooms at the following nodes as illustrated in FIG. 4:

-   -   Second level node Acupuncture 404 d     -   Second level node Herbs 404 e     -   Third level node Exercise 406 e     -   Third level node Nutrition 406 f     -   Fourth level node Nutritional Supplements 408 b

Returning to FIG. 5, at block 506, server 112 assigns display attributes to messages that originate in the current chat room and assigns respective display attributes to messages that originate in the nearby chat rooms. For example, server 112 may use chat application program 128 to retrieve and assign the current chat room display attributes 336 and nearby chat room display attributes 338. Such display attributes may be pre-defined and stored in client storage 334 at the client 102. Since messages originating in the current chat room and those originating in the nearby chat rooms are to be displayed in a single context to the user in the current chat room, the display attributes enable the messages that originate in the current chat room to be distinguished from messages that originate in the nearby chat rooms. To illustrate, the messages that originate in the current chat room may be displayed in a pre-selected color and/or font while the messages that originate in the various nearby rooms are displayed in other colors and/or fonts. Non-limiting examples of display attributes include color, color intensity, typeface, indentation, size and fonts for respective typefaces.

At block 508, server 112, with the help of chat application program 128 for example, sends the messages that originate from the current chat room and the associated nearby chat rooms to the user. According to certain embodiments, such messages are displayed in the current chat room in chronological order and in accordance with the respective display attributes. Client chat application program 330 may be used to display the messages. Server 112 may optionally send additional information to the user such as a list of active users in the nearby chat rooms, a list of users who are eavesdropping in the current chat room, and a list of active users in the current chat room.

At block 510, the user may switch or navigate to a different chat room by entering one of the “nearby” chat rooms or any chat room in the hierarchy/graph. In some embodiments the client chat program 330 enables the user to navigate to another chat room (the “destination” room) in a variety of ways, including but not limited to: selecting the destination room from a list of nearby rooms specified by the chat application program 128; double-clicking (or using some other predetermined selection method) on a displayed message that originates from the desired destination room; and using navigation buttons provided by the user interface of the client chat program 330, including “back” (enables navigation to the previous room in an ordered list of historic current rooms for the user), “forward” (enables navigation to the next room in an ordered list of historic current rooms for the user), and “next” (enables navigation to a close nearby room in the hierarchy/graph that was not necessarily a prior “current chat room” for the user). Other possible ways in which the user can navigate to a different chat room include: selecting the destination room from a listing or an illustration of the hierarchy/graph of chat rooms provided by the chat application program 128; and entering the name of the desired destination room in a text entry window.

At block 512 the user is allowed to reply to messages that are presented to them by the client chat program 330 or to enter new messages that are not associated with any existing conversation. A user can reply to or enter messages in a variety of ways. In some embodiments, to reply to a message that originated in the user's current chat room, or to enter a new message in that room, the user needs only to type a message in a message entry window provided by the client chat program 330. This message is subsequently displayed to other users of the chat system consistent with the other users' respective sets of current and nearby chat rooms (514). Alternatively, a user can click on (or otherwise select) a message that originated from the user's current chat room and type a reply in a message entry window. The resulting message when displayed for other users within the chat system can be associated with the same conversation as the original message due to its selection by the user.

In some embodiments, to reply to a displayed message that originated in another chat room the user can navigate to the originating room, enter a reply in that room, and then, if desired, navigate back to the former “current” room (for example, by using a “back” button provided by the client chat program 330 for that purpose). In some embodiments, a user can also reply to a displayed message from another chat room without leaving his/her current chat room. This can be implemented by the chat system automatically associating any user reply to a specific message with the chat room from which that message originated.

For example, in an exemplary embodiment a user has the following options to respond to and/or interact with messages displayed by the client chat program 330: They can single-click (or use another selection method) on a message to type a reply to it without moving anywhere (even if the message originated from a different chat room) and they can double-click (or use another selection method) on a message to move to the room where the message originated—with the possible option of providing a back button to return to the original room. If no message is selected, then the message is simply posted to the current room.

FIG. 6 is a schematic of a chat room GUI 600 for displaying messages to the user in the current chat room, according to certain embodiments of the invention. Client chat application program 330 manages GUI 600, according to certain embodiments. GUI 600 includes a display of information on nearby chat rooms 610, a display of information on other users 630, a message window 645, and a message entry window 655. The embodiments are not limited to the features shown in FIG. 6, and thus may vary from implementation to implementation.

As a non-limiting example, the display of information on nearby rooms 610 includes information such as room identification (ID) 612, room attributes 614, and room options 616. The display shows room IDs 612 a-i, respective room attributes 614 a-i, and respective room options 616 a-i. Examples of room attributes 614 are number of users 614 a in the room, and the distance 614 b from the current chat room. Examples of room options 616 are: 1) an “include” option 616 a for allowing the user to specify rooms for inclusion as “nearby” chat rooms, 2) an “exclude” option 616 b for allowing the user to specify rooms for exclusion from the set of “nearby” chat rooms, and 3) a “switch to” option 616 c for allowing the user to switch to a new current chat room.

The display of information on other users 630 includes information on users who are participating either in the current chat room or in the “nearby” chat rooms or users who are merely eavesdropping on the current chat room. Examples of information on other users include user id 636, room id 612 and options 640. Thus, the display of information on other users 630 shows: 1) a list of ids, such as user ids 636 a, b, . . . p, q, of users who are participating in the current chat rooms, who are in the “nearby” chat rooms, and/or who are eavesdropping, 2) the room id (room id 612 a, b, . . . h, i) of the respective users listed in user id 636, and 3) options 640 a, b etc., that are associated with the respective users listed in user id 636. Examples of options 640 are: 1) an “include” option 640 a for allowing the user to include, for viewing, messages of other users in “nearby” chat rooms as specified by the user, and 2) an “exclude” option 640 b 640 a for allowing the user to exclude, from viewing, messages of other users in “nearby” chat rooms as specified by the user.

The message window 645 displays messages 650 from various users 636 who are participating either in the current chat room or in the nearby chat rooms. To illustrate, message window 645 displays message 650 a from a user with user id 636 j. Similarly, messages 650 b and 650 i are from users with user id 636 p and 652 j, respectively. Such messages are displayed, in the current chat room, in chronological order and in accordance with the respective assigned display attributes. For purposes of explanation, assume that message 650 b originates from the current chat room, and that message 650 a is from one of the nearby chat rooms, and message 650 i is from yet another nearby chat room. To illustrate, message 650 a may be distinguished from messages 650 b, 650 i by displaying messages 650 a, 650 b, 650 j using mutually different display characteristics, such as using different display colors, and/or different fonts. Message entry window 655 allows the user in the current chat room to enter a message in the current chat room or reply to a message that is displayed in the current chat room.

The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. 

1. A method for implementing a chat room system, comprising: at a computer system having one or more processors and memory storing one or more programs, selecting, without user involvement, one or more chat rooms in a plurality of chat rooms in the chat room system based on characteristics of a current chat room, wherein the current chat room is a chat room in which a user is currently participating; sending to the user first messages and second messages for concurrent display, wherein the first messages originate from the current chat room and the second messages originate from the one or more selected chat rooms.
 2. The method of claim 1, further comprising organizing the plurality of chat rooms in a hierarchy based on topics of respective chat rooms in the chat room system.
 3. The method of claim 2, further comprising selecting the one or more chat rooms based on a graph distance between a first node of the current chat room and a second node of the one or more chat rooms in the hierarchy.
 4. The method of claim 2, further comprising selecting the one or more chat rooms by including one or more chat rooms in a sub-tree of the hierarchy, wherein the sub-tree satisfies a set of pre-determined sub-tree criteria.
 5. The method of claim 2, further comprising selecting the one or more chat rooms by including a subset of chat rooms at nodes surrounding a node of the current chat room in the hierarchy.
 6. The method of claim 1, further comprising selecting the one or more chat rooms by including one or more chat rooms based on a pre-determined set of inclusion criteria.
 7. The method of claim 1, further comprising selecting the one or more chat rooms by excluding one or more chat rooms based on a pre-determined set of exclusion criteria.
 8. The method of claim 1, further comprising selecting the one or more chat rooms by including one or more chat rooms whose titles satisfy a pre-determined set of title criteria.
 9. The method of claim 2, further comprising selecting the one or more chat rooms by including a subset of chat rooms in the hierarchy such that a combined number of active users in the subset and in the current chat room total at least a predetermined number of active users.
 10. The method of claim 2, further comprising selecting the one or more chat rooms by including a subset of chat rooms in the hierarchy such that a combined number of first messages and second messages total at least a predetermined number of messages sent to the user in the current chat room.
 11. The method of claim 2, further comprising selecting the one or more chat rooms based on a set of criteria that is defined by the user.
 12. The method of claim 1, selecting the one or more chat rooms by determining at least one similarity criterion between the one or more chat rooms and the current chat room.
 13. The method of claim 12, wherein the at least one similarity criterion is a measure of conceptual similarity between a topic associated with the current chat room and a respective topic of the one or more chat rooms.
 14. The method of claim 12, wherein the at least one similarity criterion is a measure of conceptual similarity between conversations in the current chat room and respective conversations in the one or more chat rooms.
 15. The method of claim 1, further comprising preserving a chronological relationship among the first and second messages.
 16. The method of claim 1, further comprising: assigning to the first messages respective first display attributes; assigning to the second messages respective second display attributes; and wherein the first display attributes are associated with the current chat room and the second display attributes are associated with the one or more chat rooms.
 17. The method of claim 16, wherein the second display attributes are selected based on a graph distance of the one or more chat rooms from the current chat room.
 18. The method of claim 16, wherein the first and second display attributes comprise at least one of: color; typeface; font; and color intensity.
 19. The method of claim 16, wherein the first display attributes are distinct from the second display attributes when displaying in the single context.
 20. The method of claim 1, further comprising interleaving the first messages with the second messages in chronological order.
 21. The method of claim 1, further comprising revealing to the user a list of active users in the one or more chat rooms while the user is in the current chat room.
 22. The method of claim 1, further comprising revealing to the user a list of eavesdroppers of conversations that are occurring in the current chat room.
 23. The method of claim 1, further comprising revealing to other users in the one or more chat rooms an identity of the user as an eavesdropper of conversations that are occurring in the one or more chat rooms.
 24. The method of claim 1, further comprising revealing an identity of the user in accordance with at least one of: if the user is registered with the chat room system, then revealing the identity of the user as an eavesdropper in a list associated with the one or more chat rooms; and if the user is not registered with the chat room system, then revealing the user as an eavesdropping guest in the list associated with the one or more chat rooms.
 25. The method of claim 1, further comprising revealing an identity of the user in accordance with at least one of: if the user is registered with the chat room system, then revealing the identity of the user as an active user in a first list associated with the current chat room; if the user is not registered with the chat room system, then revealing the user as an active guest in the first list associated with the current chat room; not revealing the identity of the user in the first list associated with the current chat room; and not revealing the identity of the user in a second list associated with the one or more chat rooms.
 26. The method of claim 1, further comprising enabling the user to navigate to the one or more chat rooms when the user selects a conversation that appears in the current chat room but originating from the one or more chat rooms.
 27. The method of claim 1, further comprising enabling the user to navigate to the one or more chat rooms when the user enters a reply to a conversation that appears in the current chat room but originating from the one or more chat rooms.
 28. A computer-readable storage medium carrying one or more sequences of instructions for implementing a chat room system, wherein execution of the one or more sequences of instructions by one or more processors causes the one or more processors to perform: selecting, without user involvement, one or more chat rooms in a plurality of chat rooms in the chat room system based on characteristics of a current chat room, wherein the current chat room is a chat room in which a user is currently participating; sending to the user first messages and second messages for concurrent display, wherein the first messages originate from the current chat room and the second messages originate from the one or more selected chat rooms.
 29. The computer-readable storage medium of claim 28, further comprising organizing the plurality of chat rooms in a hierarchy based on topics of respective chat rooms in the chat room system.
 30. The computer-readable storage medium of claim 29, further comprising selecting the one or more chat rooms based on a graph distance between a first node of the current chat room and a second node of the one or more chat rooms in the hierarchy.
 31. The computer-readable storage medium of claim 29, further comprising selecting the one or more chat rooms by including chat rooms in a sub-tree of the hierarchy, wherein the sub-tree satisfies a set of pre-determined sub-tree criteria.
 32. The computer-readable storage medium of claim 29, further comprising selecting the one or more chat rooms by including a subset of chat rooms at nodes surrounding a node of the current chat room in the hierarchy.
 33. The computer-readable storage medium of claim 29, further comprising selecting the one or more chat rooms by including one or more chat rooms based on a pre-determined set of inclusion criteria.
 34. The computer-readable storage medium of claim 29, further comprising selecting the one or more chat rooms by excluding one or more chat rooms based on a pre-determined set of exclusion criteria.
 35. The computer-readable storage medium of claim 29, further comprising selecting the one or more chat rooms by including one or more chat rooms whose titles satisfy a pre-determined set of title criteria.
 36. The computer-readable storage medium of claim 29, further comprising selecting the one or more chat rooms by including a subset set of chat rooms in the hierarchy such that a combined number of active users in the subset and in the current chat room total at least a predetermined number of active users.
 37. The computer-readable storage medium of claim 29, further comprising selecting the one or more chat rooms by including a subset set of chat rooms in the hierarchy such that a combined number of first messages and second messages total at least a predetermined number of messages sent to the user in the current chat room.
 38. The computer-readable storage medium of claim 29, further comprising selecting the one or more chat rooms based on a set of criteria that is defined by the user.
 39. The computer-readable storage medium of claim 29, selecting the one or more chat rooms by determining at least one similarity criterion between the one or more chat rooms and the current chat room.
 40. The computer-readable storage medium of claim 39, wherein the at least one similarity criterion is a measure of conceptual similarity between a topic associated with the current chat room and a respective topic of the one or more chat rooms.
 41. The computer-readable storage medium of claim 39, wherein the at least one similarity criterion is a measure of conceptual similarity between conversations in the current chat room and respective conversations in the one or more chat rooms.
 42. The computer-readable storage medium of claim 28, further comprising preserving a chronological relationship among the first and second messages.
 43. The computer-readable storage medium of claim 28, further comprising: assigning to the first messages respective first display attributes; assigning to the second messages respective second display attributes; and wherein the first display attributes are associated with the current chat room and the second display attributes are associated with the one or more chat rooms.
 44. The computer-readable storage medium of claim 43, wherein the second display attributes are selected based on a graph distance of the one or more chat rooms from the current chat room.
 45. The computer-readable storage medium of claim 43, wherein the first and second display attributes comprise at least one of: color; typeface; font; and color intensity.
 46. The computer-readable storage medium of claim 43, wherein the first display attributes are distinct from the second display attributes when displaying in the single context.
 47. The computer-readable storage medium of claim 28, further comprising interleaving the first messages with the second messages in chronological order. 